Adsorption of 4 He on neon-coated exfoliated graphite

TLDR: In this article, the binding energy of 4He on Grafoil coated with a monolayer of neon was calculated for the temperature range of 2-10 K and in the pressure range of 0.10-15.00 Torr.

Abstract: Adsorption isotherms of 4He on Grafoil coated with a monolayer of neon were made for the temperature range of 2–10 K and in the pressure range of 0.10–15.00 Torr, using a standard volumetric method. From these isotherms the isosteric heats of adsorption were calculated as a function of coverage. The binding energy of 4He on Ne was obtained from the isosteric heat for V → 0, yielding a value of 39.4 K. The differential molar entropy and the internal molar energy were calculated as a function of coverage. A comparison of monolayer coverage obtained by analyzing different procedures is presented. Whenever possible the results are compared with theoretical evaluations and previous experimental data.